I liked this adventure more than Barrow of the Forgotten King. There is plenty of room for improvement, and it will teach you why oldschool gamers always search for traps, secret doors, and hidden treasure in every room, but overall its a decent dungeon-crawl. When people do that in newer adventures, it seems almost a bit of a waste of time, but it is required for this type of mod.
Barrow of the Forgotten King seemed more linier, and a weaker story, despite this dungeon crawl ment to be RP/Story-lite. The story I think starts to tighten up a bit toward the end, but the first does little to hold your attention, which should be the most key part of an adventure. There are entire articles about adventure hooks... obviously because its an important part of an adventure.
Even though the fights in this mod gave us more trouble than in Barrow, I think Barrow actually had more unbalanced fights. In this mod, our party was average at best; our PCs for Barrow were a lot more powerful, and a similiar number of PCs (3 PCs plus 1 NPC), but Barrow was built more around a 4-man group and Lost Vault was built more around a 6-man group.
